Interactive report display

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Hi,

I am not able to get the alv output when i select a display pushbutton in selection screen, and when i select a line and pree a change button there is no action in the code,Below is the way of code i did

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At Selection Screen Output

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AT SELECTION-SCREEN OUTPUT .

Have two buttons create and display.

SET PF-STATUS 'ZTEST1'.

**======================================================================

*

At Selection Screen

**======================================================================

*

AT SELECTION-SCREEN.

have 2 buttons change and delete

SET PF-STATUS 'ZTEST2'.

IF sy-ucomm = 'CREATE'.

PERFORM create_screen_3.

ENDIF.

IF sy-ucomm = 'DISPLAY'.

PERFORM create_screen_2.

ENDIF.

&----

*& Form USERACTION

&----

FORM useraction USING ucomm LIKE sy-ucomm

r_selfield TYPE slis_selfield.

CASE ucomm.

WHEN 'DELETE'.

DELETE gt_final WHERE select NE 'X'.

ENDCASE.

ENDFORM. "useraction

Call ALV

CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'

EXPORTING

i_callback_program = gv_wrk_repid

i_callback_pf_status_set = 'ZTEST2'

i_callback_user_command = g_command

it_fieldcat = gv_wrk_fieldcat[]

i_save = 'A'

TABLES

t_outtab = gt_final

EXCEPTIONS

program_error = 1

OTHERS = 2.

Thanks,

Deesanth